Preselector



April 13 1943v EI .lf MASTNEY 2,316,270

PRasELEcToR Filed-Aug. v, 1942 Patented Apr. 13, 1943 NETE.

Si ES "TN QFFIQ PRESELECTOR Edward J. Mastney, Berwyn, Ill., assigner toQak Mfg. Co., Chicago, lll., a corporation of Illinois 1 Claim.

This invention relates to a preselector and particularly to animprovement thereon for adjusting the same. The reselector proper isgenerally of the type shown in my Patent 2,161,183, granted-June 6,1939.

r:Che invention will be described with reference to the drawing whereinFigure 1 shows an elevation partly in section of the pre-selectingmechanism. Figure 2 is a side view of a pre-selector unit in a normalposition. Figure 3 is a sectional elevation of one end of thepreselector unit and specifically showing the invention herein claimed'.Figure 4 is an exploded view of the manual adjustment of the preselectorunit.

A base I@ has mounted thereon a gang condenser frame it supportingstator plates i2. Rotatively mounted on frame i I is a condenser lshaft13 carrying rotor plates Se cooperatively associated with the statorplates. rIhis gang condenser is an example of a device which is to beturned to predetermined positions. The mechanism for doing this ismounted upon base I!) and includes a pair of supporting plates i5 and i6bolted to base Ill.

Rotatively mounted in plates I5 and i6 is a shaft il'. One end of shaftE1 is rotatively coupled to condenser shaft I 3 by a suitable universaljoint means i3. Shaft E1 is provided with sleeves I9 and 23, both alike.As clearly shown, these sleeves have shoulder portions 2| and 2L bearingon the inside faces of plates I5 and i6 and in effect constituting endthrust sleeves. The shoulder ends of these sleeves are preferably sofabricated as to provide a small annular clearance 23 around shaft I1.

Between sleeves i9 and 20 are uve identical control units 25-29inclusive. Referring to unit 29, as an example, there is provided acenter washer 3i) snugly tting shaft I1. As shown in the correspondingwasher of unit 28, the center washer is provided with a radiallyextending finger 3l'. On opposite sides of center washer 60 are sleeves32 and 33 having the same general construction as sleeves I9 and 2G.Thus sleeve 32 has a cylindrical portion 35 extending to a shoulder 36and then an enlarged cylindrical portion 31. Enlarged cylindricalportion 31 is so shaped on the interior that an annular region 38 isprovided around shaft I1.

Sleeve 33 is the image of sleeve 32 and is provided with the samedetails. Rotatively mounted on reduced cylindrical portion is a washer4G having a finger similar to nger LII on washer 40 of unit 28. Asclearly shown in unit 28, finger 4I' is bent over to lie in the path oftravel of nnger 3i' of the center washer. Beyond this washer t@ is agear e2 provided with a finger 33 bent over to lie in the path of travelof nger ll of the adjacent washer. Sleeve 33 is similarly provided witha washer and gear.

Each unit is controlled by a pair of offset racks 5t and 5I (see unit2S) engaging the gears 42 and 42 of each unit and disposed on oppositesides of shaft I1. These two racks are carried by a lever 52. It isclear that upon downward movement of the two racks, the two gears of aunit will be urged in opposite directions. Assuming center washer 36 isxed relative to shaft I1, then each unit will tend to cause shaft I 1 towave l to a predetermined position upon downward movement of the racks.This is more fully explained in the patent referred to herein.

In order to guide each lever and rack means, a top plate 55 is carriedby side plates I5 and l@ as by ears 56. Plate 55 is slotted to journallever 52. Additional strengthening members 51 and 58 extend between sideplates l5 and I6 to provide a rigid structure. Each lever 52 may have abutton 63 tted thereon.

As is evident, the operation of the device requires that each centerwasher 3B of a unit be dxed relative to shaft I1. In addition, topreselect the stopping point for each unit, requires that each `centerwasher be readily adjustable with reference to shaft I1. This isprovided in the following manner.

Between sleeve 20 and unit 29 are two large washers 6I and 62 loose onshaft I1. These two washers are spread by a spring washer 63 bent sothat this spring washer may be compressed by forcing the two largewashers together. Immediately beyond sleeve 2i), portion 61 0f shaft l1is mutilated to provide two ats 65 and 66.

Portion 61 of the shaft, is adapted to accommodate the manual adjustingmeans. As clearly evident in Figure 4, this adjusting means oomprises agenerally L shaped member 1I) whose body portion 1I is provided with anaperture 12. This aperture consists o-f two straight sides and twocurved sides and has the same outline as the shaft with the flats. Sincethe mutilated portion of the shaft extends to the very end, it isevident that body 1I may be moved over the shaft and be rotatably lockedthereto although movable lengthwise along the shaft. L shaped member 10has a head portion 13 carrying a well 14. Head portion 13 is aperturedat 15 so that well 'I4 provides a through aperture beyond head portion13.

A cam block 16 has a pair of legs 11 and 18 spaced just far enough apartto straddle the shaft at the portion where fats 55 and B5 are. Thus, camblocks 16 may be readily disposed over the shaft and, like L shapedmember 1D, is rotatably locked to the shaft although freely movablealong the same. Cam block 'IS has a flat face 'I9 normally adjacent bodyportion 'H of member 10. On the other side, cam block 'E5 has anirregular outline. Thus, the upper portion of this side of the block hasa substantially straight plane face 80. The bottom portion of this faceof the lblock is cut away to provide a generally triangular outline 8|as seen from the side of the block. This outline provides two slopingcam faces 82 and 83 along the front portions of legs 'Il and 18.

Cooperating with cam block i6 is another cam block 85 having a roundaperture 86 therethrough and having a fiat rear face 81. The front faceof cam block 85 has an upper plane face 88 adapted to cooperate withface S0 of cam block 16 and also has a protruding cam section 89 adaptedto cooperate with the correspondingly shaped portion of cam block '58.While aperture 86 of cam block 85 is shown as round, it may be shapedsimilarly to aperture 12 to rotatably lock cam block 85 to the shaft.However this is unnecessary and would require extreme accuracy inaligning the cooperating camblocks. It is preferred to have aperture 35round and large enough so that this second cam block may slip over theshaft and be turned to any position. j

Cooperating with the first cam block 76 is an adjusting bolt 9G having aslotted head 9| and a collar 92. Bolt 9E is adapted to cooperate withthe threaded aperture 98 extending through the top portion of cam block76, permitting bolt 98 to be adjusted up and down within the spacebetween legs 'Il and 18.

The entire adjusting means is maintained in position on the shaft asshown in Figures 1 and 3 between sleeve 20 and knob 95 threaded orlocked on the shaft at the end of portion El. It is preferred to haveenough space between sleeve 28 and knob 95 so that the portions of theunit as shown in exploded form in Figure 4 have some play on the shaft.Bolt 90 is disposed below top portion 'I3 of member 'l0 and the variousparts are so proportioned that collar 92 engages top portion 13 whilepermitting head 9| of the bolt to extend up inside of well 14. Thus asbolt 90 is turned in one direction it tends to pull cam block 16upwardly as seen in Figure 3. The reaction of cam block 'I5 on secondcam block 85 results in the inclined faces 82 and 83 riding onprotruding portion 89 and results in a cam action which tends toseparate the two cam blocks. The net result is that by turning bolt 90in a direction tending to move it down, the cam blocks are spread. Sincethe second cam block 85 is free to move along the shaft, it reactsagainst sleeve 20 and forces all the preselecting units tightly againsteach other. Thus, the various sleeves are tightly clamped and the unitsare maintained in predetermined adjusted position.

What is claimed is:

In a device of the character described, a shaft, means normallyrotatable with respect to said shaft but adapted to be clamped inadjusted position by side thrust, an adjusting member threaded on saidshaft and engaging said normally rotatable means to exert side thrustthereon, said adjusting member having a cam face thereon, a secondadjusting member having a cam face cooperating with said first cam face,said second adjusting member being disposed on said shaft and having alimited degree of movement transverse to said shaft, a bolt threadedlyengaging said second member and extending transversely of said shaft,and a third member disposed on said shaft and having a part engagingsaid bolt, said third member permitting said bolt to turn and adjust thetransverse position of said second member whereby cooperating camsurfaces adjust the transverse dimension of the device.

EDWARD J. MASTNEY.

